EVANSTON, Ill. - Music training has well-known benefits for the developing brain, especially for at-risk children. But youngsters who sit passively in a music class may be missing out, according to new Northwestern University research.

Jessica Smith often exercises at her Miami home because it's more convenient and affordable than hitting the gym. Several times a week, she also records her workout sessions and uploads them to YouTube, so thousands of her closest friends can sweat right along with her.

The Ice Bucket Challenge has raised millions of dollars for ALS charities, including the Amyotrophic Lateral Sclerosis (ALS) Association and the Chicago-based Les Turner ALS Foundation. But how will the money be used? While the details on spending the funds are being worked out, Dr. Lucie...